http://arxiv.org/abs/2203.13008
The evaporation of Primordial Black Hole (PBH) via Hawking radiation influences the evolution of Inter Galactic Medium by heating up the latter and consequently affects the 21cm signal originated from the neutral Hydrogen atoms. In this work, we have considered EDGES observational data of 21cm line corresponding to cosmic dawn era to constrain the mass and the abundance of PBHs. In this context, three different PBH mass distributions namely, monochromatic, power law and lognormal mass distributions are considered to estimate the effects of PBH evaporation on the 21cm brightness temperature $T_{21}$. The impacts of Dark Matter – baryon interactions on $T_{21}$ are also considered in this work along with the influences of PBH evaporation. Further an attempt has been made in this work to formulate a mass distribution expression for the PBHs in the context of the 21cm results considered here. The mass distribution best suited for the present purpose is found to be a combination of an error function and Owen function. Bounds on Dark Matter mass are also calculated in this work by considering the PBH mass distributions.
U. Mukhopadhyay, D. Majumdar and A. Halder
Fri, 25 Mar 22
21/46
Comments: 22 pages, 9 figures